JP2004251151A - Fan guard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan guard capable of remarkably controlling noises caused by a fan, even if mesh is made smaller. <P>SOLUTION: The fan guard 1 is provided so as to correspond to the fan 6 and comprised of a frame crosspiece member 22, and supporting crosspiece members 23 and auxiliary crosspiece members 24 combined like grids. At least one side faces of both side faces of the supporting crosspiece members 23 and the auxiliary crosspiece members 24 are formed to be inclined planes 23A or 24A in order that the both side faces of the supporting crosspiece members 23 and the auxiliary crosspiece members 24 approach to each other in an upwind side constituted by the fan 6 and separate each other in a downwind side. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fan guard of a blower used for, for example, a cooling device.
[0002]
[Prior art]
Conventionally, a cooling device includes a cooler in a main body, a motor, a blower having a plurality of blades attached to the motor, a fan casing provided around the blower and the motor, and an abbreviation of the blower. And a fan guard provided on the front side (see Patent Document 1).
[0003]
In such a case, the fan casing made of a steel plate accommodates a cooler, an electric motor and a blower therein, and a metal wire fan guard having leg-shaped mounting portions at approximately four corners is screwed to the discharge port side of the fan casing. Being fixed. This fan guard was assembled by spot welding a metal wire at a crossing portion thereof and was formed in a mesh shape.
[0004]
[Patent Document 1]
JP-A-2001-27472
[Problems to be solved by the invention]
However, in the conventional fan guard, when the safety is carefully considered, the mesh is too large, so that the operator's fingers may enter the fan guard and damage the fingers. For this reason, a fan guard having a mesh formed so as not to allow fingers to enter is attached to the cooling device. In such a case, however, there is a problem that wind resistance by the blower becomes extremely large and noise is generated.
[0006]
Then, this invention is made in order to solve the conventional technical problem, and an object of this invention is to provide the fan guard which can suppress the noise by a blower remarkably even if a mesh is made small.
[0007]
[Means for Solving the Problems]
The fan guard of the present invention is provided corresponding to the blower and is composed of a crosspiece that is combined in a lattice shape, and the crosspieces are close to each other on the windward side of the wind whose both sides are formed by the blower. In addition, at least one of the side surfaces is an inclined surface so as to be separated on the leeward side.
[0008]
According to the present invention, provided in correspondence with the blower, in the fan guard composed of the crosspieces combined in a lattice, the crosspieces are close to each other on the windward side of the wind composed of the blowers on both sides, Since at least one of the side surfaces is inclined so as to be separated on the leeward side, the area of the end face of the crosspiece on the leeward side of the wind formed by the blower can be reduced.
[0009]
Also, the crosspiece gradually widens toward the leeward side while the side surface is inclined, so that the resistance of the wind hitting the side surface can also be reduced, and the noise can be reduced as a whole.
[0010]
Furthermore, the width of the leeward side and the width of the leeward side are made narrower and the leeward side is made wider without making the whole narrower, so that the strength of the fan guard itself can be maintained.
[0011]
A fan guard according to a second aspect of the present invention is the fan guard according to the above invention, wherein the width of the crosspiece at the leeward end of the inclined surface is 30% to 80% of the width of the crosspiece at the leeward end of the inclined surface. It is characterized by having done.
[0012]
According to the invention of claim 2, in the above invention, the width of the crosspiece at the leeward end of the inclined surface is set to 30% or more and 80% or less of the width of the crosspiece at the leeward end of the inclined surface. Thereby, the resistance of the wind hitting the side surface can be reduced, and the noise can be reduced.
[0013]
In the fan guard according to the third aspect of the present invention, the distance from the leeward end of the inclined surface to the leeward end of the crosspiece is 10% of the total size of the crosspiece in the wind flow direction. It is characterized by being at least 40% or less.
[0014]
According to the third aspect of the present invention, in each of the above inventions, the distance from the leeward end of the inclined surface to the leeward end of the crosspiece is 10% or more of the full size of the crosspiece in the wind flow direction. Since it is set to 40% or less, the inclination of the side surface can be sufficiently ensured, whereby the resistance of the wind hitting the side surface can be reduced, and the noise can be reduced.
[0015]
A fan guard according to a fourth aspect of the present invention is characterized in that, in each of the above inventions, the windward and leeward end surfaces of the crosspiece are arc-shaped.
[0016]
According to the invention of claim 4, in each of the above inventions, the windward and leeward end surfaces of the crosspiece are formed in an arc shape, so that the resistance of the wind hitting the crosspiece can be further reduced. .
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a cooling unit U to which the fan guard 1 of the present invention is applied, FIG. 2 is a plan view of the cooling unit U, and FIG. 3 is a front view of the cooling unit U. The cooling unit U is installed in a cooling storage such as a prefabricated refrigerator / refrigerator.
[0018]
The cooling unit U is installed, for example, on a ceiling surface on the storage room side of a heat-insulating box constituting a cooling storage, and is provided in an exterior case 4 having a front grille 2 having a plurality of discharge ports 3 formed on the front surface. A cooling device including a compressor, a condenser, and the like disposed in a separately installed outdoor unit (not shown), a cooler 5 forming a known refrigeration cycle, and a cooling blower for discharging cool air to the front grill 2 side 6, 6 (two in this embodiment).
[0019]
The outer case 4 is formed by bending a plate-like member such as aluminum to form a main body 7 having openings on both side surfaces and a lower surface, and a frame cover 8 for opening and closing a lower opening front portion of the main body 7. And side plates 9 and 9 respectively closing both side surfaces. At approximately four corners of the upper surface of the main body 7, holding portions 12 for holding screw members (not shown) that fix the cooling unit U to the storage room top surface are attached.
[0020]
A drain pan (not shown) located below the cooler 5 is provided at the front of the frame cover 8, and drain water generated during the defrosting operation of the cooler 5 is discharged to the drain pan. Hose 14 is connected. The frame cover 8 is formed to be inclined upward from the center to the rear, and the cool air suction port 11 is formed on the inclined surface.
[0021]
A fan case 13 for holding the blowers 6 for the coolers disposed in the main body 7 is provided around the periphery of the cool air suction port 11, and the fan case 13 further includes a fan case 13. The fan guards 1 of the present invention for covering the cooler blowers 6, 6 held from the storage room side are detachably mounted. Note that the cooler blower 6 is configured to draw in air from the fan guard 1 side and discharge air taken into the exterior case 4 from the discharge port 3 formed in the front grill 2 via the cooler 5. And
[0022]
Next, the fan guard 1 of the present invention will be described with reference to FIGS. 4 is a front view of the fan guard 1, FIG. 5 is a side view of the fan guard 1, FIG. 6 is a sectional view taken along line AA of FIG. 4, and FIG. 7 is a sectional view taken along line BB of FIG. The fan guard 1 of the present embodiment includes a frame bar 22 made of, for example, ABS resin, a plurality of support bars 23, and a plurality of auxiliary bars 24.
[0023]
The frame member 22 has a substantially circular shape and forms a main body frame of the fan guard 1, and a plurality of mounting claws 22A for detachably fixing the fan guard 13 to the fan case 13 are provided on the back surface. It is formed in several places. The frame beam 22 is provided with a plurality of support beams 23 radially from the center of the frame beam 22 toward the frame beam 22. Each support beam 23 is shown in FIG. It is curved forward and protrudes by a predetermined dimension. The support bar 23 has a plurality of auxiliary bars 24 that are concentric with the frame bar 22 and that are different in size from the frame bar 22 and intersect with the support bar 23. Is provided. Thus, the fan guard 1 is formed by combining the support bars 23 and the auxiliary bars 24 in the frame bar 22 in a lattice shape.
[0024]
Here, FIG. 6 shows a sectional view taken along the line AA of FIG. 4, that is, a sectional view of the auxiliary beam 24, and FIG. 7 shows a sectional view of the line BB of FIG. ing. In this embodiment, the auxiliary crosspiece 24 and the support crosspiece 23 are inclined on both sides such that both sides are close to each other on the windward side of the wind formed by the cooler blower 6 and are separated on the leeward side. 24A or 23A.
[0025]
In this embodiment, the width of the auxiliary beam 24 at the leeward end of the inclined surface 24A is about 50% of the width of the auxiliary beam 24 at the leeward end of the inclined surface 24A. The distance r1 from the side end to the leeward end of the auxiliary rail 24 was set to about 30% of the total dimension R1 of the auxiliary rail 24 in the wind flow direction. In addition, the four corners of the auxiliary crosspiece 24 were all arc-shaped.
[0026]
The width of the support beam 23 at the windward end of the inclined surface 23A is about 70% of the width of the support beam 23 at the leeward end of the inclined surface 23A. The distance r2 from the portion to the leeward end of the support bar 23 was about 30% of the total dimension R2 of the support bar 23 in the wind flow direction. In addition, all four corners of the support bar 23 were formed in an arc shape.
[0027]
With the above configuration, when the cooler blower 6 is operated, the air that has flowed into the outer case 4 from the gaps formed by the crosspieces 22, 23, and 24 of the fan guard 1 by the cooler blower 6 is as described above. It is cooled by the cooler 5 and is discharged from the discharge port 3 of the front grill 2 into a storage room (not shown) to cool the storage room to a predetermined temperature. Further, the cool air circulated in the storage room returns from the fan guard 1 of the cooling unit U to the inside of the outer case 4 again.
[0028]
Here, in the present embodiment, the crosspieces 23 and 24 forming the fan guard 1 are combined in a lattice shape, and the crosspieces 23 and 24 are mutually opposed on the windward side of the wind whose both sides are formed by the blower 6. The two side surfaces are inclined surfaces 23A and 24A so that they are close to each other and separated on the leeward side, so that the area of the end faces of the crosspieces 23 and 24 on the windward side of the wind formed by the blower 6 can be reduced. Become like
[0029]
In particular, since each of the crosspieces 23, 24 gradually widens toward the leeward side while the side surfaces are inclined, the resistance of the wind hitting the inclined surfaces 23A, 24A forming the side surfaces can also be reduced, and the noise as a whole can be reduced. Can be reduced.
[0030]
Furthermore, the crosspieces 23 and 24 are formed relatively thin in order to make the mesh of the fan guard 1 fine by not making the whole narrow but only the windward side narrow and the leeward side wide. Also, the strength of the fan guard 1 itself can be maintained.
[0031]
In the present embodiment, the inclined surfaces 23A, 24A formed on each of the crosspieces 23, 24 are formed on both side surfaces. However, only one of the side surfaces may be formed with the inclined surfaces 23A, 24A. Shall be.
[0032]
Further, in this embodiment, the width of each of the support bars 23 and the auxiliary bars 24 forming the fan guard 1 and the width of each of the bars 23, 24 at the windward end of the inclined surface 23A or 24A is determined. Alternatively, since the width of each crosspiece 23, 24 at the leeward end of 24A is set to 30% or more and 80% or less, the resistance of the wind hitting the side surface can be further reduced, and the noise can be reduced. become able to.
[0033]
Further, the distance between the support beam 23 and the auxiliary beam 24 forming the fan guard 1 from the leeward ends of the inclined surfaces 23A and 24A to the leeward ends of the respective beams 23 and 24 is set as follows. Since 10% or more and 40% or less of the entire size of each of the crosspieces 23 and 24 in the wind distribution direction, the inclination of the side surface can be sufficiently ensured, thereby also reducing the resistance of the wind hitting the side surface. And noise can be reduced.
[0034]
Further, since the windward and leeward end surfaces of the crosspieces 23 and 24 are formed in an arc shape, the resistance of the wind hitting the crosspieces 23 and 24 can be further reduced.
[0035]
In addition, by inverting the lattice shape of the fan guard 1, even when the blower 6 discharges the wind, the resistance of the wind can be reduced, and the noise due to the wind noise can be suppressed. .
[0036]
【The invention's effect】
As described above in detail, according to the present invention, the fan guard is provided corresponding to the blower, and is composed of the crosspieces arranged in a grid, in which the crosspieces are located on the windward side of the wind whose both sides are formed by the blowers. Since at least one of the side surfaces is an inclined surface so as to be close to each other and separated on the leeward side, the area of the end face of the crosspiece on the windward side of the wind formed by the blower can be reduced. Become like
[0037]
Also, the crosspiece gradually widens toward the leeward side while the side surface is inclined, so that the resistance of the wind hitting the side surface can also be reduced, and the noise can be reduced as a whole.
[0038]
Furthermore, the width of the leeward side and the width of the leeward side are made narrower and the leeward side is made wider without making the whole narrower, so that the strength of the fan guard itself can be maintained.
[0039]
According to the invention of claim 2, in the above invention, the width of the crosspiece at the leeward end of the inclined surface is set to 30% or more and 80% or less of the width of the crosspiece at the leeward end of the inclined surface. Thereby, the resistance of the wind hitting the side surface can be reduced, and the noise can be reduced.
[0040]
According to the third aspect of the present invention, in each of the above inventions, the distance from the leeward end of the inclined surface to the leeward end of the crosspiece is 10% or more of the full size of the crosspiece in the wind flow direction. Since it is set to 40% or less, the inclination of the side surface can be sufficiently ensured, whereby the resistance of the wind hitting the side surface can be reduced, and the noise can be reduced.
[0041]
According to the invention of claim 4, in each of the above inventions, the windward and leeward end surfaces of the crosspiece are formed in an arc shape, so that the resistance of the wind hitting the crosspiece can be further reduced. .
[Brief description of the drawings]
FIG. 1 is a vertical sectional side view of a cooling unit to which a fan guard of the present invention is applied.
FIG. 2 is a plan view of a cooling unit.
FIG. 3 is a front view of the cooling unit.
FIG. 4 is a front view of the fan guard of the present invention.
FIG. 5 is a side view of the fan guard.
FIG. 6 is a sectional view taken along line AA of FIG. 4;
FIG. 7 is a sectional view taken along the line BB of FIG. 4;
[Explanation of symbols]
R Cooling unit 1 Fan guard 3 Discharge port 4 Outer case 5 Cooler 6 Cooling blower 22 Frame beam 22A Mounting claw 23 Support beam 23A, 24A Inclined surface 24 Auxiliary beam

Claims (4)

A fan guard that is provided corresponding to the blower and is composed of crosspieces combined in a lattice shape,
The crosspiece is characterized in that at least one of the side surfaces is an inclined surface so that both side surfaces are close to each other on the windward side of the wind formed by the blower and separated on the leeward side. A fan guard. The width of the crosspiece at the windward end of the slope is 30% or more and 80% or less of the width of the crosspiece at the leeward end of the slope. One fan guard. The distance from the leeward end of the inclined surface to the leeward end of the crosspiece is set to be 10% or more and 40% or less of the entire dimension of the crosspiece in the flow direction of the wind. 3. The fan guard according to claim 1 or claim 2. The fan guard according to claim 1, wherein the upwind and downwind end surfaces of the crosspiece are arc-shaped.

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